Mid and Deep Circulation in the Japan Sea

日本海中深层环流

• 批准号: 06041081
• 负责人: YOON Jong-hwan
• 金额: $ 6.46万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06041081/
• 关键词: Salinity minimum layr; deep current measurement; CTD; ARGOS BUOY; winter convection; chemical tracer; South westward counter current; Japan Sea; Flying Fish; 測流; 深層水; 係留系

The Japan Sea is a mini ocean and a very good test basin for the numerical ocean prediction. However, so far, the intermediate and deep circulation haven't been well understood. We carried out 4 cruises to survey the circulation below the surface layr during two fiscal years (1994,1995) as international cooperative field researches between Japan, Korea nad Russia.The CTD and chemistry measurements during the summer cruise in the main part of the Japan Sea (1994,7.5-7.25) showed the increase of the temperature in the deep layr with the rate of 0.02 C per 10 years and the oxgen decrease, suggesting no formation of the deep water during at least last ten years. Strong mesoscale activities with the time scale of month and the velocity exceeding 20 cm/s were detected in the deep Japan Basin by analyzing the recovered long-term (1993.8-1994.8) current mooring data. Many informations about the distribution of the salinity minimum layr with the oxgen maximum were obtained in this cruise.The second winter cruise (1996.2.15-2.25) carried out off Vladivostok in '96 winter detected the deep convection reaching 600m depth, while no sign of deep convection could be found in the first winter cruise (1995.3.1-3.15), because the winter in 1995 was warm.The ADCP and CTD measurements carried out during the summer cruise off the wakasa bay (1995.5.26-6.8) observed the subsurface counter current below the nearshore branch of the Tsushima current over the continental shelf break with the speed exceeding 10 cm/s. The presence and the structure of this undercurrent correspond well to the results of several numerical models.Many new aspects about the intermediate and deep clrculation found in this research will contribute much to the future studies for the Japan Sea circulation.

日本海是一个小型海洋，是海洋数值预报的一个很好的试验海盆。然而，到目前为止，对中、深部环流的认识还不够深入。作为日、韩、俄三国的国际合作实地考察，我们在两个财政年度(1994、1995)共进行了4个航次的表层环流调查。1994年、7.5-7.25年夏季航次在日本海主要海域进行的CTD和化学测量表明，深层温度以每10年0.02℃的速度升高，氧含量下降，表明至少最近10年没有深水的形成。通过对恢复的长期(1993.8-1994.8)海流系泊资料的分析，发现日本海盆深处有较强的中尺度活动，活动的时间尺度为月，速度超过20 cm/S。在这次巡航中获得了许多关于盐度最小层和最大含氧量分布的信息。1996年冬季在符拉迪沃斯托克附近进行的第二次冬季巡航(1996.2.15-2.25)发现了深对流到600米深，而第一次冬季巡航(1995.3.1-3.15)没有发现深对流的迹象，由于1995年冬季气候温暖，对马对流近岸支下方的对马洋流在大陆架附近以10 cm/S以上的速度破裂，这一潜流的存在和结构与几个数值模式的结果吻合得很好。这一研究中发现的许多关于中、深部环流的新方面将对日本海环流的未来研究有很大的帮助。

项目成果

Hirose N.,C.-H.Kim and J.-H.Yoon: "Sea Surfacce heat fluxes in the yellow Sea and the East China Sea." J.of Oceanography. (in press). (1996)

Hirose N.,C.-H.Kim 和 J.-H.Yoon：“黄海和东海的海面热通量。”

Seung, Y.H.and J.-H.Yoon: "Some features about winter convection in the Japan Sea." J.of Oceanography. 51 (1). 61-73 (1995)

Seung, Y.H. 和 J.-H.Yoon：“日本海冬季对流的一些特征。”

T.Gamo: "A submersible flow through analyzer for in situ colorimetric measurement down to 2000 m depth in the Ocean" Analytical Sciences. 10. 843-848 (1994)

T.Gamo：“用于在海洋深处 2000 米深度进行原位比色测量的潜水式流通分析仪”分析科学。

Seung Y.H.and J.-H.Yoon: "Robust Diagnostic Modeling of the Japan Sea Circulation." J.of Oceanography. 51(4). 421-440 (1995)

Seung Y.H. 和 J.-H.Yoon：“日本海环流的稳健诊断模型”。

T.Yangi: "Sea Level Variation in the Eastern Asia" J.Oceanogr. 50. 643-651 (1994)

T.Yangi：“东亚海平面变化”J.Oceanogr。